813129919 has 4 divisors (see below), whose sum is σ = 929291344. Its totient is φ = 696968496.

The previous prime is 813129887. The next prime is 813129931. The reversal of 813129919 is 919921318.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 813129919 - 2⁵ = 813129887 is a prime.

It is a super-2 number, since 2×813129919² = 1322360530345893122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813129979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58080702 + ... + 58080715.

It is an arithmetic number, because the mean of its divisors is an integer number (232322836).

Almost surely, 2^813129919 is an apocalyptic number.

813129919 is a deficient number, since it is larger than the sum of its proper divisors (116161425).

813129919 is a wasteful number, since it uses less digits than its factorization.

813129919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116161424.

The product of its digits is 34992, while the sum is 43.

The square root of 813129919 is about 28515.4329968878. The cubic root of 813129919 is about 933.3688735474.

It can be divided in two parts, 8131299 and 19, that added together give a palindrome (8131318).

The spelling of 813129919 in words is "eight hundred thirteen million, one hundred twenty-nine thousand, nine hundred nineteen".